package com.atguigu.gulimall.ware.service.impl;

import com.alibaba.fastjson.TypeReference;
import com.atguigu.common.to.mq.OrderTo;
import com.atguigu.common.to.mq.StockDetailTo;
import com.atguigu.common.to.mq.StockLockedTo;
import com.atguigu.common.utils.R;
import com.atguigu.common.exception.NoStockException;
import com.atguigu.gulimall.ware.entity.WareOrderTaskDetailEntity;
import com.atguigu.gulimall.ware.entity.WareOrderTaskEntity;
import com.atguigu.gulimall.ware.feign.OrderFeignService;
import com.atguigu.gulimall.ware.feign.ProductFeignService;
import com.atguigu.gulimall.ware.service.WareOrderTaskDetailService;
import com.atguigu.gulimall.ware.service.WareOrderTaskService;
import com.atguigu.gulimall.ware.vo.OrderItemVo;
import com.atguigu.gulimall.ware.vo.OrderVo;
import com.atguigu.gulimall.ware.vo.SkuHasStockVo;
import com.atguigu.gulimall.ware.vo.WareSkuLockVo;
import com.rabbitmq.client.Channel;
import lombok.AllArgsConstructor;
import lombok.Data;
import org.springframework.amqp.core.Message;
import org.springframework.amqp.rabbit.annotation.RabbitHandler;
import org.springframework.amqp.rabbit.annotation.RabbitListener;
import org.springframework.amqp.rabbit.core.RabbitTemplate;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.io.IOException;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.atguigu.common.utils.PageUtils;
import com.atguigu.common.utils.Query;

import com.atguigu.gulimall.ware.dao.WareSkuDao;
import com.atguigu.gulimall.ware.entity.WareSkuEntity;
import com.atguigu.gulimall.ware.service.WareSkuService;
import org.springframework.transaction.annotation.Transactional;


@Service("wareSkuService")
public class WareSkuServiceImpl extends ServiceImpl<WareSkuDao, WareSkuEntity> implements WareSkuService {
    @Autowired
    WareSkuDao wareSkuDao;

    @Autowired
    ProductFeignService productFeignService;

    @Autowired
    WareOrderTaskService orderTaskService;

    @Autowired
    WareOrderTaskDetailService orderTaskDetailService;

    @Autowired
    RabbitTemplate rabbitTemplate;

    @Autowired
    OrderFeignService orderFeignService;


    /**
     * 解锁库存
     *
     * @param skuId
     * @param wareId
     * @param num
     * @param taskDetailId
     */
    public void unLockStock(Long skuId, Long wareId, Integer num, Long taskDetailId) {
        //库存解锁
        wareSkuDao.unlockStock(skuId, wareId, num);
        //更新库存工作单的状态
        WareOrderTaskDetailEntity entity = new WareOrderTaskDetailEntity();
        entity.setId(taskDetailId);
        entity.setLockStatus(2);//变为已解锁
        orderTaskDetailService.updateById(entity);

    }

    @Override
    public PageUtils queryPage(Map<String, Object> params) {
        IPage<WareSkuEntity> page = this.page(
                new Query<WareSkuEntity>().getPage(params),
                new QueryWrapper<WareSkuEntity>()
        );

        return new PageUtils(page);
    }

    /**
     * 添加库存
     *
     * @param skuId
     * @param wareId
     * @param skuNum
     */
    @Override
    public void addStock(Long skuId, Long wareId, Integer skuNum) {
        //1、判断如果还没有这个库存记录新增
        List<WareSkuEntity> entities = wareSkuDao.selectList(new QueryWrapper<WareSkuEntity>().eq("sku_id", skuId).eq("ware_id", wareId));
        if (entities == null || entities.size() == 0) {
            WareSkuEntity skuEntity = new WareSkuEntity();
            skuEntity.setSkuId(skuId);
            skuEntity.setStock(skuNum);
            skuEntity.setWareId(wareId);
            skuEntity.setStockLocked(0);
            //TODO 远程查询sku的名字，如果失败，整个事务无需回滚
            //1、自己catch异常
            //TODO 还可以用什么办法让异常出现以后不回滚？高级
            try {
                R info = productFeignService.info(skuId);
                Map<String, Object> data = (Map<String, Object>) info.get("skuInfo");

                if (info.getCode() == 0) {
                    skuEntity.setSkuName((String) data.get("skuName"));
                }
            } catch (Exception e) {

            }
            wareSkuDao.insert(skuEntity);
        } else {
            wareSkuDao.addStock(skuId, wareId, skuNum);
        }

    }

    /**
     * 查询sku是否有库存
     *
     * @param skuIds
     * @return
     */
    @Override
    public List<SkuHasStockVo> getSkusHasStock(List<Long> skuIds) {
        List<SkuHasStockVo> collect = skuIds.stream().map(skuId -> {
            SkuHasStockVo vo = new SkuHasStockVo();
            // SELECT SUM(stock-stock_locked) FROM `wms_ware_sku` WHERE sku_id=1;
            Long count = baseMapper.getSkuStock(skuId);
            vo.setSkuId(skuId);
            vo.setHasStock(count == null ? false : count > 0);
            return vo;
        }).collect(Collectors.toList());

        return collect;
    }

    /**
     * 锁定库存
     *
     * @param vo
     * @return rollbackFor = NoStockException.class默认只要是运行时晕车都会回滚
     * 库存解锁的场景
     * 1）下订单成功，订单过期没有支付被系统自动取消、被用户手动取消都要解锁库存
     * <p>
     * 2）下订单成功，库存锁定成功，接下的业务调用失败，导致订单回滚
     * 之间锁定的库存就要自动解锁
     */
    @Override
    @Transactional
    public Boolean orderLockStock(WareSkuLockVo vo) {
        //保存库存工作单的详情
        WareOrderTaskEntity taskEntity = new WareOrderTaskEntity();
        taskEntity.setOrderSn(vo.getOrderSn());
        orderTaskService.save(taskEntity);

        //1、知道每个商品在哪个仓库都有库存
        List<OrderItemVo> locks = vo.getLocks();

        List<SkuWareHasStock> collect = locks.stream().map(item -> {
            SkuWareHasStock stock = new SkuWareHasStock();
            Long skuId = item.getSkuId();
            stock.setSkuId(skuId);
            stock.setNum(item.getCount());
            //查询这个商品在哪里有库存
            List<Long> wareIds = wareSkuDao.listWareIdHasSkuStock(skuId);
            stock.setWareId(wareIds);
            return stock;
        }).collect(Collectors.toList());

        //2、锁定库存
        Boolean allLock = true;
        for (SkuWareHasStock hasStock : collect) {
            Boolean skuStocked = false;
            Long skuId = hasStock.getSkuId();
            List<Long> wareIds = hasStock.getWareId();
            if (wareIds == null || wareIds.size() == 0) {
                //没有任何仓库有这个商品的库存
                throw new NoStockException(skuId);
            }
            //如果每一个商品都锁定成功，将当前商品绑定了几件的工作单记录发给MQ
            //锁定失败，前面保存的工作单信息就回滚了，发出去的信息即使要解锁记录，由于去数据库查不到id，所以就不用解锁
            for (Long wareId : wareIds) {
                //成功返回1 ，否则为0
                Long count = wareSkuDao.lockSkuStock(skuId, wareId, hasStock.getNum());
                if (count == 1) {
                    skuStocked = true;
                    // TODO 告诉MQ库锁定成功
                    WareOrderTaskDetailEntity entity = new WareOrderTaskDetailEntity(null, skuId, "", hasStock.getNum(), taskEntity.getId(), wareId, 1);
                    orderTaskDetailService.save(entity);
                    StockLockedTo lockedTo = new StockLockedTo();
                    lockedTo.setId(taskEntity.getId());
                    StockDetailTo stockDetailTo = new StockDetailTo();
                    BeanUtils.copyProperties(entity, stockDetailTo);
                    lockedTo.setDetailTo(stockDetailTo);
                    rabbitTemplate.convertAndSend("stock-event-exchange", "stock.locked", lockedTo);
                    break;
                } else {
                    //TODO 当前仓库锁失败,重试一下个仓库
                }
            }
            if (skuStocked == false) {
                //当前商品所有仓库都没有锁住
                throw new NoStockException(skuId);
            }
        }
        //3、肯定全部都是锁定成功
        return true;
    }

    /**
     * 解锁库存
     *
     * @param to
     */
    @Override
    public void unlockStock(StockLockedTo to) {
//        try {
        StockDetailTo detail = to.getDetailTo();
        Long detailId = detail.getId();
        //解锁
        //查询数据库关于这个订单的锁定库存信息
        //  ①有。证明库存锁定成功了
        //          解锁：订单情况
        //          1、没有这个订单，必须解锁
        //          2、有这个订单，不是解锁库存
        //              订单状态：已取消：解锁库存
        //                        没有取消，不能解锁
        //  ②没有：库存锁定失败了，库存回滚了，这个情况无需解锁
        WareOrderTaskDetailEntity byId = orderTaskDetailService.getById(detailId);
        if (byId != null) {
            //有，解锁
            Long id = to.getId();//库存工作单的id
            WareOrderTaskEntity taskEntity = orderTaskService.getById(id);
            String orderSn = taskEntity.getOrderSn();//根据订单号查询订单状态
            R r = orderFeignService.getOrderStatus(orderSn);
            if (r.getCode() == 0) {
                //订单数据返回成功
                OrderVo data = r.getData(new TypeReference<OrderVo>() {
                });

                if (data == null || data.getStatus() == 4) {
                    //订单不存在
                    //订单已经被取消了，才能解锁库存
                    if (byId.getLockStatus() == 1) {
                        unLockStock(detail.getSkuId(), detail.getWareId(), detail.getSkuNum(), detailId);
                    }
//                        channel.basicAck(message.getMessageProperties().getDeliveryTag(),false);
                } else {
                    //消息拒绝以后重新放到队列中，让别人继续消费解锁
//                        channel.basicReject(message.getMessageProperties().getDeliveryTag(),true);
                    throw new RuntimeException(("远程服务失败"));
                }
            }

        }
//            else {
        //没有，无需解锁
//                channel.basicAck(message.getMessageProperties().getDeliveryTag(),false);
//            }
//        } catch (Exception e) {
//            //消息拒绝以后重新放到队列中，让别人继续消费解锁
////            System.out.println("错误。。"+e.getMessage());
////            channel.basicReject(message.getMessageProperties().getDeliveryTag(),true);
//        }
    }

    /**
     * 解锁订单
     * * 防止订单服务卡顿，导致订单状态消息一直改不了，库存消息优先到期，查订单状态新建状态，什么都不做就走了
     * 导致卡顿的订单用户不能解锁库存
     *
     * @param orderTo
     */
    @Transactional
    @Override
    public void unlockStock(OrderTo orderTo) {
        String orderSn = orderTo.getOrderSn();
        //查询最新库存状态，防止重复解锁库存
        WareOrderTaskEntity task = orderTaskService.getOrderTaskByOrder(orderSn);
        Long id = task.getId();
        //按照工作单找到所有，没有解锁的库存进行解锁
        List<WareOrderTaskDetailEntity> entities = orderTaskDetailService.list(new QueryWrapper<WareOrderTaskDetailEntity>()
                .eq("task_id", id)
                .eq("lock_status", 1));
        for (WareOrderTaskDetailEntity entity : entities) {
            unLockStock(entity.getSkuId(),entity.getWareId(),entity.getSkuNum(),entity.getId());
        }


    }

    @Data
    class SkuWareHasStock {
        private Long skuId;
        private Integer num;
        private List<Long> wareId;
    }
}